Photo by: Darron Cummings
In this photo taken Friday, Aug. 6, 2010, Indiana defensive end Kevin Bush, left, talks with defensive end coach George Ricumstrict during a NCAA college football practice in Bloomington, Ind. (AP Photo/Darron Cummings)

Robert Mueller’s special counsel investigation into Russian meddling in the 2016 election has cost $6.7 million during the first four and a half months of the probe. Click to see past independent counsel investigations guilty of racking up high bills.